6. Which of the following amino acids has a charged polar side chain at pH 7.0?(A)Leu(B)Ala(C)Met(D)Trp(E) Glu

7.The isoelectronic point of an amino acid is the point where (A)the pKa of the a-carboxylic acid is the same as the pK, of the a-amino group. (B)the a-carboxylic acid is protonated and the a-amino group is unprotonated. (C)the solubility of the amino acid is maximized. (D)the a-carboxylic acid and the a-amino group are both half protonated.(E)the amino acid carries no net electrical charge.

6. Which of the following amino acids has a charged polar side chain at pH 7.0?

(A)Leu

(B)Ala

(C)Met

(D)Trp

(E) Glu

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